A Study on the Lyrics of Japanese Pop Music From 2008 to 2020

This paper examines the lyrics of the Top 10 songs on the annual Billboard Japan charts from 2008 to 2020, analyzing their word count, density, and linguistic composition, while also identifying recurring themes.The results indicate that the average word count and density of lyrics had generally increased over the period, though the use of foreign languages remained relatively stable.Additionally, songs with a theme of "love" consistently dominated, regardless of the time period.These trends reflect the accelerated pace of society and the commercial nature of popular music.